Sectional boiler.



No. 653,246. Patented July I0, 1900. .1. KEITH.

SECTIONAI. BOILER.

(Application-filed Nov. 14, 1899.)

2 SheetsSheet I.

(N0 Model.)

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No. 653,246. Patented My ID, I900. J. KEITH.

SECTIONAL BOILER.

(Application filed Nov. 14, 1889.)

2 Sheets-Sheet 2,

(No Model.)

IN 115N708 WITNESSES.

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UNITED STATES PATENT OFFICE.

JAMES KEITH, OF LONDON, ENGLAND.

SECTIONAL BOILER.

SPECIFICATION forming part of Letters Patent No. 653,246, dated July 10,1900. Application filed November 14, 1899. Serial No. 736,979- (Nomodel.)

To all whom it may concern:

Be it known that 1, JAMES KEITH, a citizen of the United Kingdom ofGreat Britain and Ireland, residing at 27 Farringdon avenue, London,England, have invented certain Improvements in Sectional Hot-WaterBoilers, (which has been patented in Great Britain on the 21st dayofApril, 1899, No. 8,368,) of which the following is a specification.

This invention relates to sectional hot-water boilers for use chiefly inheating buildings by circulation of the heated water through piping; andit has for its object to provide, in combination with such boilers, aseparate fu rnace or fuel-chamber preferably having auxiliarywater-heating surface and so arranged that the main boiler is heated bythe firegases passing through it from the fuel-chamher and impingingupon its heating-surfaces.

The invention is illustrated by the accompanying drawings.

Figure l is a vertical section, and Fig. 2 a plan, of the improvedsectional hotwater boiler. Fig. 3 is an elevation in section of theboiler shown in Fig. 1, but showing a modified form of the furnaceportion of said boiler. Fig. 4 is a detail View.

The main portion A of the boiler is preferably of the vertical sectionaltype described in the specification of my British Patents Nos. 2,709 of1879 and 5,744 of 1885; but it may be of the horizontal formationdescribed in the specification of my British Patent No. 3,013, of1887,0r of other type; but in each case the fire-grate is removed and aclosed gas-combustion chamber B takes the place of the f uelspace, thesaid chamber B being surrounded by fire-bricks B and having a fire-brickbottom B Alongside of the main boiler A is fitted an auxiliarywater-heater 0, containing the fuel-chamber D or magazine, the saidheater being either made in a single piece and tapered, as shown at Fig.3, or in sections with parallel sides corresponding to those of the mainboiler A, as shown at Fig. 1, and so formed that the fuel is inclosedcentrally by a water-jacket O. The fuel is fed in at or near the topthrough a doorway E and rests on a rocking or other firegrate F, fittedin a hollow base G at the bottom. The fire-gases instead of passingthrough the 'body of fuel in the fuel-chamber D are led through apassage or flue H, which is fitted to connect the aux iliary heater 0 tothe main boiler A and pass into the combustion-chamber B, whence theyascend and, after parting with their heat by impinging against theheating-surfaces of the boiler A, escape by a chimney-I at the upper orfarther end of the boiler. The water space or jacket 0 around thefuel-chamber D is connected to that of the boiler A or to the main flowand return pipes from boiler byseparate flow and return pipes J K, asshown at Figs. 1 and 2. The heater 0 instead of being connected as abovedescribed may have its upper and lower ends connected by a separate flowand return pipe, as shown at Fig. 3.

The boiler proper, A, is heated solely by the hot gases from the fire inthe fuel-chamber D or magazine of the auxiliary heater 0, and thuscontact of fuel and formation of ash in the main boiler A is avoided,while as combustion in the fuel-chamber D is downward and the draftthrough the fire-bars and lower part of the fuel and in the main boilerA is upward perfect combustion is insured, as well as economy in fueland absence of smoke. The separate magazine 0 may also be of suchdimensions that firing once a day may suffice. The said magazine may beformed without having the waterjacket around it and without theaccompanying circulating-pipes mentioned.

The sections A of the main boiler A above the combustion-chamber B areor may be all formed with cross-tubes A to provide a maximum ofheating-surface, and access to these for cleaning may be had byproviding the usual doors in the sides of the boiler. Olinker and ashdoors L M are also provided for the furnace or fire grate of theauxiliary heater G, and air-registers N may also be provided in thegeneral base for regulating the admission of air to the fire-gratethrough the boilerbase. The air-register N or registers may be opened orclosed by hand or it or they may be automaticallyoperated throughmechanical devices acted on by the rising and falling of the temperatureof the water or of the air of the apartments heated by the boiler.

In each of the sections A two orifices A A are formed at each corner topermit of the passage of water from one section to the other, one ofthese, A beingin the upper wall and the other, A, in the lower wall ofeach section and each corner pair being exactly opposite each other. Theupper orifices A are formed with lips A or are otherwise suitably formedso that the jointing of one section to the other may be made water-tightby the insertion at this point between the sections of i a metallic orother packing ring. A bolt A is passed down through each of the cornerorifices, and nuts A are strung on these bolts to be on the uppermostand lowermost sections A and draw the whole together, these lattersections having their outermost orifices, which are covered by the nutupon the In a hot-Water boiler, the combination of a main boilercomposed of a series of watercontaining sections joined together andinclosing a central combustion-chamber having a fire-brick bottom, eachsection having its Water-space connected to that of its neighbors and anauxiliary water-heater or furnace connected thereto by a fire-brickpassage, and composed of a single or a series of water-containingsections similarly jointed and inclosing a central fuel-space providedat its upper end with a firing-door and at its lower end with afire-grate, the main boiler and auxiliary heater having the water-spacesof their highest and lowest sections connected together by flow andreturn pipes respectively.

In witness whereof I have hereunto set my hand in presence of twoWitnesses.

J AMES KEITH.

Witnesses:

WALLACE FAIRWEATHER, J NO ARMSTRONG, J unr.

